memory can be divided into 2 aspect:(1)retention:is the ability of the mind to take in and store information.(2)recall:is the ability to select from the vast store the special piece of information we need at any given time.there are five factors,which are responsible to total recall.(1)primary.(2)recency. (3)linking.(4)outstanding.(5)review. people generally tend to remember the beginning of events more than the middle of events.